Our Collection

At the Institute’s core is the Gilder Lehrman Collection, one of the great archives in American history. More than 85,000 items cover five hundred years of American history, from Columbus’s 1493 letter describing the New World through the end of the twentieth century.

[Cost estimates to dig a canal]

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Gilder Lehrman Collection #: GLC02437.08440 Author/Creator: Place Written: s.l. Type: Manuscript document Date: circa 1790 Pagination: 1 p. ; 10.1 x 19.3 cm. Order a Copy

Estimates labor costs to build a 90 mile canal with 60 locks at "386.400" dollars. Estimates it would take 1,000 men about 2 years to complete.

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